Impact of pasteurization of human milk on preterm newborn in vitro digestion: Gastrointestinal disintegration, lipolysis and proteolysis
Résumé
Human milk feeding is an important recommendation for preterm newborns considering their vulnerability
and digestive immaturity. Holder pasteurization (62.5 C, 30 min) applied in milk banks modifies its
biological quality and its microstructure. We investigated the impact of pasteurization of preterm human
milk on its gastrointestinal kinetics of lipolysis, proteolysis and structural disintegration. An in vitro
dynamic system was set up to simulate the gastrointestinal digestion of preterm newborns. A pool of preterm
human milk was digested as raw or after Holder pasteurization. Pasteurization impacted the
microstructure of undigested human milk, its gastrointestinal disintegration and tended to limit the
intestinal lipolysis. Furthermore, the gastrointestinal bioaccessibility of some fatty acids was decreased
by pasteurization, while the intestinal bioaccessibility of some amino acids was selectively modulated.
The impact of pasteurization on the digestion of human milk may have nutritional relevance in vivo
and potentially modulates preterm development and growth.